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SGI Indigo
SGI Indigo
SGI Indigo
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Silicon Graphics Indigo
Also known asSGI IRIS Indigo
DeveloperSGI
Type3D Graphics workstation
Release date1991
Discontinued1995
PredecessorSGI IRIS 4D
SuccessorSGI Indigo2
SGI Crimson
SGI Indigo, front
SGI Indigo, back

The Indigo, introduced as the IRIS Indigo, is a line of workstation computers developed and manufactured by Silicon Graphics, Inc. (SGI). SGI first announced the system in July 1991.[1]

The Indigo is one of the most capable graphics workstations of its era, and was essentially peerless in the realm of hardware-accelerated three-dimensional graphics rendering. For use as a graphics workstation, the Indigo was equipped with a two-dimensional framebuffer or, for use as a 3D graphics workstation, with the Elan graphics subsystem including one to four Geometry Engines (GEs). SGI sold a server version with no video adapter.

The Indigo's design is based on a simple cube motif in indigo hue. Graphics and other peripheral expansions are accomplished via the GIO32 expansion bus.

The Indigo was superseded generally by the SGI Indigo2, and in the low-cost market segment by the SGI Indy.

Technical specifications

[edit]

The first Indigo model (code-named Hollywood) was introduced on July 22, 1991. It is based on the IP12 processor board, which contains a 32-bit MIPS R3000A microprocessor soldered on the board and proprietary memory slots supporting up to 96 MB of RAM.[1][2]

The later version (code-named Blackjack) was introduced in July 1992, priced from $12,485, utilising a 64-bit MIPS R4000SC processor clocked externally at 50 MHz.[3] The model is based on the IP20 processor board, which has a removable processor module (PM1 or PM2) containing a R4000 (100 MHz) or R4400 processor (100 MHz or 150 MHz) that implements the MIPS-III instruction set. The IP20 uses standard 72-pin SIMMs with parity, and has 12 SIMM slots for a total of 384 MB of RAM at maximum.[4]

A Motorola 56000 DSP is used for Audio IO, giving it 4-channel 16-bit audio. Ethernet is supported on board by the SEEQ 80C03 chipset coupled with the HPC (High-performance Peripheral Controller), which provides the DMA engine. The HPC interfaces primarily between the GIO bus and the Ethernet, SCSI (WD33C93 chipset) and the 56000 DSP. The GIO bus interface is implemented by the PIC (Processor Interface Controller) on IP12 and MC (Memory Controller) on IP20.

Much of the hardware design can be traced back to the SGI IRIS 4D/3x series, which shared the same memory controller, Ethernet, SCSI, and optionally DSP as the IP12 Indigo. The 4D/30, 4D/35 and Indigo R3000 are all considered IP12 machines and run the same IRIX kernel. The Indigo R3000 is effectively a reduced cost 4D/35 without a VME bus. The PIC supports a VME expansion bus (used on the 4D/3x series) and GIO expansion slots (used on the Indigo). In all IP12, IP20, and IP22/IP24 (see SGI Indigo2) systems the HPC attached to the GIO bus.

Graphics options

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Entry graphics

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For entry graphics, the 8-bit color frame buffer[5] comes in three versions. One version uses the system's GIO expansion bus. Another uses the main backplane like the XS, XZ, and Elan graphics options. The final is the same, but adds a second video output, giving the computer the ability to have two "heads", or monitors.

XS Graphics

[edit]

The Indigo's XS Graphics option has a single GE7 Geometry Engine (GE), a RE3 Raster engine, a HQ2 Command engine, VC1, XMAP5. It is ideal for low-cost wireframe operations, compared to more powerful, and expensive options for textured graphics.[5] Part of SGI's Express line of graphics, four XS graphics options were produced for the Indigo: the XS-8 offers 8-bit color, with one VM2 video RAM module; the XS-Z adds the ZB-4 Z buffer; the XS-24 adds two VM2 modules and offers 24 color bits and 32 bits including brightness; and the XS-24Z adds a Z buffer.

XZ Graphics

[edit]

The XZ graphics option is also a member of SGI's Express graphics line. It is similar to the XS-24z, but it includes a second GE7 Geometry Engine ASIC, doubling its geometry performance.

Elan Graphics

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The highest performance graphics option offered for the Indigo, it is a member of SGI's Express graphics line. It is like the XS-24z and XZ, but has 4 GE7 Geometry Engine ASICs, giving it twice the performance of the XZ option.[4][6]

Operating system

[edit]

The Indigo was designed to run IRIX, SGI's version of Unix.[2] The Indigos with R3000 processors are supported up to IRIX version 5.3, and Indigo equipped with an R4000 or R4400 processor can run up to IRIX 6.5.22.

Additionally, the free Unix-like operating system NetBSD has support for both the IP12 and IP20 Indigos as part of the sgimips port.[7]

SGI timeline

[edit]
SGI VirtuSGI PrismSGI Origin 3000 and Onyx 3000Origin 2000SGI ChallengeOnyx 300Onyx 2SGI OnyxSGI CrimsonSGI AltixSGI Origin 200SGI Indigo² and Challenge MSGI TezroSGI Octane2SGI OctaneSGI Indigo² and Challenge MSGI IRIS 4DSGI FuelSGI IndigoSGI IRIS 4DSGI O2SGI O2SGI IndySGI IRIS 4DSGI IRISSGI IRISSGI IRISVisual WorkstationSGI IRISSGI IRIS
[edit]

The Indigo was featured in Jurassic Park as the rendering system for Samuel L. Jackson's character Arnold and his station to render graphics for Park Control Systems. It was paired to a Macintosh Quadra 700.[8]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

SGI Indigo

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The SGI Indigo (also known as the IRIS Indigo) is a line of high-performance UNIX workstations developed and manufactured by , Inc. (SGI), renowned for their advanced 3D graphics capabilities and compact design, serving as a pivotal entry-level system in SGI's portfolio from 1991 to 1995. Introduced on July 22, 1991, the initial Indigo model featured a 33 MHz MIPS R3000A RISC processor, delivering 30 MIPS performance and 26 SPECmarks, with expandable memory up to 96 MB and storage up to 1.3 GB via II interface. It ran 4.0, SGI's proprietary UNIX-based operating system, supporting standards like IRIS GL for graphics, X11/R4, and , while including onboard audio processing for CD-quality sound and video capabilities. Priced starting at $7,995 for a base configuration with an 8 MB RAM and 16-inch color monitor (no disk), it targeted engineers, scientists, and creative professionals seeking affordable 3D visualization and tools, marking SGI's push into more accessible high-end computing. In 1992, SGI upgraded the line with the Indigo R4000, incorporating a 100 MHz (later 150 MHz R4400) 64-bit MIPS R4000-series processor—the first such desktop implementation from the company—boosting performance to approximately 70 SPECmarks and 85 MIPS, a roughly 300% improvement over the R3000 model. Graphics options evolved from basic 2D framebuffers (e.g., LG1/LG2) to advanced 3D accelerators like XS24 (24-bit color, ) and Elan (for high-end rendering with alpha blending and ), connected via the GIO expansion bus. Memory expanded to 384 MB in R4000 variants using proprietary SIMMs, and systems included Ethernet, serial ports, and a Motorola 56000 DSP for audio, emphasizing real-time 3D manipulation for applications in CAD, , and scientific . The Indigo series, codenamed "Hollywood" for its initial IP12 board, was produced until August 1995, with service support ending in July 2003, paving the way for successors like the Indigo² and Indy. Its innovative integration of RISC processing, accelerated , and in a mini-tower form factor solidified SGI's reputation in professional visualization, influencing industries from film effects to design during the early 1990s workstation boom.

Development and release

Announcement and initial models

The IRIS Indigo workstation was announced by , Inc. (SGI) on July 22, 1991, marking the company's entry into the desktop workstation market with a focus on affordable for visualization tasks. This initial release introduced the Hollywood model, based on the IP12 board set, which served as the foundational hardware platform for the series. The system was positioned as a successor to SGI's IRIS 4D series, offering binary compatibility while shifting to a more compact, cost-effective desktop form factor suitable for individual professionals rather than large-scale server environments. At launch, the Hollywood model's core specification centered on a 33 MHz MIPS R3000A 32-bit RISC processor, delivering approximately 30 MIPS of performance and 26 SPECmarks, paired with an integrated R3010 floating-point unit. Key features included the GIO32 expansion bus for peripherals, up to 96 MB of RAM, and onboard audio processing via a Motorola 56000 digital signal processor supporting 4-channel 16-bit DAT-quality output with a built-in microphone. The workstation was the first from SGI to integrate optional 3D graphics acceleration directly into a desktop chassis, enabling dynamic 2D/3D rendering, texture mapping, and alpha blending through the IRIS Graphics Library. Targeted at , scientific, and creative professionals in fields like , CAD, and , the aimed to democratize advanced visualization tools previously limited to higher-end systems. Base configurations started at $7,995 for an 8 MB RAM model with a 16-inch color monitor, while systems with a 236 MB disk drive were priced at $9,995, making it accessible for professional desktops around the $10,000 mark when equipped for typical workloads. Volume shipments began in September 1991 through direct sales, value-added resellers, and SGI's Express program.

Evolution and variants

Following its initial launch, the SGI Indigo saw significant evolution with the introduction of the platform in July 1992, which utilized the IP20 board set and featured a 64-bit MIPS R4000SC processor running at 100 MHz. This upgrade marked a shift to 64-bit processing, enabling enhanced performance for graphics-intensive workloads while maintaining compatibility with the original chassis design. Subsequent variants expanded the processor options, including configurations with the at 50 MHz external clock speeds (100 MHz internal), as well as the more powerful R4400 at 150 MHz, all integrated via the IP20 and upgradable within existing Indigo enclosures. These iterations allowed users to boost computational capabilities without full system replacement, supporting a range of professional applications from CAD to scientific visualization. The -based models continued alongside these, forming the core of the R3000 and product lines until production ceased in 1995. Upgrade paths were a key aspect of the Indigo's longevity, permitting straightforward CPU daughterboard swaps from the original to or R4400 modules, which also expanded maximum RAM capacity from 96 MB in early IP12 systems to 384 MB using standard 72-pin SIMMs in IP20 setups. Later units incorporated minor revisions for reliability, such as upgraded power supplies (e.g., part 9430812 for /R4400 models) and improved interfaces based on the WD33C93 , addressing power efficiency and peripheral connectivity in sustained production runs. The platform was eventually discontinued in 1995, paving the way for successors like the Indigo2 and Indy workstations.

Hardware architecture

Processor and chipset

The SGI Indigo workstation featured a lineup of MIPS RISC processors tailored for desktop computing, beginning with the 32-bit MIPS R3000A CPU operating at 33 MHz, which was an integer-only design requiring a separate R3010 floating-point unit (FPU) for scalar operations. Later variants upgraded to the 64-bit MIPS R4000 series, including the R4000 at 100 MHz and the R4400 at 150 MHz, both with integrated FPUs to handle double-precision floating-point computations efficiently. These processors marked the Indigo as the first SGI desktop system to support 64-bit addressing, enabling larger memory spaces and improved handling of complex datasets in graphics and scientific applications. The supporting chipset varied by processor generation: the IP12 boardset for R3000-based systems integrated the CPU, FPU, and directly, while the IP20 boardset for R4000-series models used a with the processor on a daughterboard attached to the main CPU board for easier upgrades. Both chipsets interfaced with a GIO bus for expansion, with practical implementations limited to GIO32 slots operating at up to 33 MHz, providing sufficient bandwidth for peripherals. Performance benchmarks highlighted the progression across models, with the R3000A delivering approximately 30 MIPS and 4.2 MFLOPS, suitable for basic tasks, while the at 100 MHz achieved around 85 MIPS and 16 MFLOPS, offering over 2.5 times the integer throughput for more demanding simulations. The R4400 further improved this to an estimated 120 MIPS, emphasizing the series' scalability for professional workloads. Cache configurations optimized data access latency: the R3000A utilized 32 KB instruction and 32 KB data caches managed externally via the chipset, whereas the featured 8 KB on-chip instruction and data caches, paired with an optional 1 MB secondary unified cache to reduce memory bottlenecks in compute-intensive environments. The R4400 doubled the primary caches to 16 KB each for instruction and data, maintaining the 1 MB secondary option. The Indigo's design prioritized low-power operation for desktop deployment, with processors exhibiting thermal design power (TDP) in the 50-100 W range across the lineup, supported by efficient 210-250 W power supplies that minimized heat generation and noise compared to higher-end SGI servers.

Memory and expansion

The SGI Indigo workstations utilized error-detecting parity DRAM for main memory, implemented via single in-line memory modules (SIMMs). The R3000-based models (IP12 architecture) employed proprietary 72-pin SIMMs, with 12 slots organized into three banks of four, supporting configurations from a minimum of 8 MB (using four 2 MB modules) up to a maximum of 96 MB (using twelve 8 MB modules). In contrast, the R4000-based models (IP20 architecture) used standard 36-bit wide 72-pin fast page mode (FPM) SIMMs with parity checking at 70 ns access times, also featuring 12 slots in three banks of four, allowing expansions from 8 MB (four 2 MB modules) to 384 MB (twelve 32 MB modules). Memory had to be installed in matched sets of four modules per bank for proper interleaving and error detection functionality. Caching in the Indigo series integrated primary caches on the CPU for variants or externally for , with secondary cache options limited to . The processor included 32 KB instruction and 32 KB data primary caches managed externally via the but lacked secondary caching. The processor featured smaller 8 KB instruction and 8 KB data primary caches on-chip, augmented by a standard 1 MB external secondary (L2) cache module for improved performance in compute-intensive tasks. Later upgrades within the lineup doubled primary cache sizes to 16 KB each while retaining the 1 MB L2. Expansion capabilities centered on the GIO32 bus, a 32-bit synchronous multiplexed interface without PCI compatibility, reflecting its pre-PCI design era. Both and models provided two GIO32 slots (upgradable to GIO32bis on for enhanced signaling), enabling add-in cards for networking, storage controllers, or other peripherals. The bus delivered a theoretical peak bandwidth of approximately 132 MB/s at 33 MHz clock speeds, supporting sustained transfers for attached devices but limited by the era's hardware constraints. Note that SIMM compatibility was not interchangeable between and boards due to differing versus standard module designs, requiring full motherboard replacement for upgrades.

Peripherals and connectivity

The SGI Indigo workstation featured a narrow SCSI-2 interface for storage, utilizing a 50-pin connector and a 33C93B controller, which allowed connection of up to seven devices including hard disk drives (HDDs) and tape units. This setup supported HDDs with capacities up to 2 GB, such as 3.5-inch SCSI-2 models like the Seagate ST11200N, and optional (DDS) tape drives for backup purposes. The system included three internal 3.5-inch hot-swappable drive bays—accessible via front-panel sleds for easy installation without powering down—enabling configurations with a system disk, secondary storage, and peripherals like or floppy drives. Networking capabilities centered on a built-in 10 Mbps Ethernet interface with a 15-pin AUI port for connecting to local area networks. For higher-speed or specialized connectivity, optional expansion cards installed via the GIO bus provided support for Fiber Distributed Data Interface (FDDI) adapters—available in single-attachment station (SAS) or dual-attachment station (DAS) variants with fiber optic ports—and Asynchronous Transfer Mode (ATM) interfaces from vendors like Fore Systems. Audio hardware integrated a digital signal processor (DSP) to handle 16-bit stereo input and output, supporting sample rates up to 48 kHz for applications. This included five 1/8-inch stereo jacks for headphones, microphone, line-level inputs/outputs, and speakers, along with 4-channel connectivity for interfacing with musical instruments and sequencers. The Indigo provided standard input/output ports for peripheral integration, including two RS-232 serial ports via Mini-DIN 8-pin connectors compatible with Macintosh-style cabling, a DB-25 for printers and other devices, and a Mini-DIN 6-pin (ADB) port for keyboard and mouse. An optional video input capability was available through interfaces using BNC connectors, enabling synchronization with external video sources for broadcast and animation workflows. The system's compact desktop tower form factor measured approximately 25 cm wide by 38 cm high by 28 cm deep (about 10 x 15 x 11 inches), weighing around 17 kg when configured with a single drive and graphics option, which facilitated placement on standard desks while accommodating internal expansions. The hot-swappable bays and rear-panel layout for ports and networking ensured practical connectivity without compromising the space-efficient design.

Graphics subsystems

Entry-level graphics

The entry-level graphics subsystem for the SGI Indigo workstation, known as Entry Graphics or Starter Graphics, consists of the LG1 or LG2 board, which provides a basic depth framebuffer for 2D display tasks. This configuration supports a maximum resolution of 1024×768 pixels at a 60 Hz , making it adequate for standard office productivity and entry-level (CAD) applications without requiring advanced rendering capabilities. The hardware is implemented as a dedicated graphics board rather than an integrated component on the , featuring a simple 2D accelerator but lacking any geometry engine for 3D operations. Output connectivity includes a 13W3 for high-resolution analog monitors and a 15-pin VGA for , with no support for hardware or . Dual-monitor setups are possible by installing two Entry Graphics boards, extending the display across multiple screens for enhanced productivity in 2D workflows. As a cost-effective alternative to higher-end 3D graphics options, the Entry Graphics subsystem was positioned for users focused on general-purpose computing, reducing overall system expense while maintaining compatibility with the IRIX operating system's windowing environment.

XS Graphics

The XS Graphics subsystem provided moderate 3D acceleration for the SGI Indigo workstation through a single GE7 geometry engine chip mounted on a GR2 graphics motherboard. This configuration included an HQ2 command engine for geometry processing, a RE3 raster engine for pixel operations, a VB1.1 video buffer with RAMDAC, and optional VC1 and XMAP5 components for mapping and output. The GE7 chip delivered 32 MFLOPS of floating-point performance dedicated to 3D transformations and lighting calculations, enabling hardware-accelerated pipeline stages for vertex processing, clipping, and shading. In its base form, XS Graphics supported 8-bit color via one VM2 video memory module, while upgraded variants like XS24 added two more VM2 modules for 24-bit true color and an optional ZB4 board for a 24-bit Z-buffer; 8-bit alpha buffering was available for blending operations in color modes. The subsystem occupied a single GIO32 slot on the Indigo's backplane, allowing integration without impacting system I/O. Stereo output was supported through a dedicated 3-pin Mini-DIN connector, and anti-aliasing capabilities included RGB line and point filtering as well as full-scene accumulation buffering for enhanced image quality. Performance emphasized balanced 3D rendering for visualization tasks, with measured rates including 140,000 depth-cued Gouraud-shaded Z-buffered lines per second, 98,000 flat-shaded triangle strips per second, 50,000 lit Gouraud-shaded Z-buffered triangles per second, and 24,000 lit Gouraud-shaded independent quadrilaterals per second under a 100 MHz CPU. Resolutions reached up to 1280×1024 pixels at 60 Hz or 72 Hz refresh rates, with support for double-buffered RGB or color-index modes and synchronization via BNC input. These features positioned XS Graphics as an entry into SGI's 3D ecosystem, bridging 2D display capabilities with initial hardware geometry acceleration.

XZ Graphics

The XZ Graphics subsystem represents a mid-tier upgrade in the SGI Indigo's Express family, optimized for accelerated through parallel processing. It incorporates two GE7 Engine ASICs, each delivering up to 32 MFLOPS of floating-point performance, for a combined 64 MFLOPS dedicated to transformations, lighting, and clipping operations. This dual-chip effectively doubles the geometry throughput of the single GE7-based XS Graphics, enabling smoother handling of complex 3D models in applications like CAD and visualization. Key features include a shared frame buffer accessible by both engines, advanced fog and haze effects for depth simulation, and stencil buffering with 4 dedicated bitplanes for masking and compositing. The system supports 24-bit RGB alongside a 24-bit Z-buffer for precise hidden surface removal, with additional capabilities like , , alpha blending, and multiple light sources. Video RAM is configured in 8 to 16 MB increments using three VM2 modules, sufficient for resolutions up to 1280x1024 at 60 or 72 Hz refresh rates, and it supports configurations, including dual displays via appropriate setup via 13W3, BNC, and miniDIN connectors. As a boardset comprising a GR2 , raster engine (RE3), and supporting video components (including and ZRB4 for output and Z-handling), the XZ occupies two GIO32 slots on the Indigo's , reflecting its expanded hardware footprint over simpler options.

Elan Graphics

The Elan Graphics subsystem represented the pinnacle of 3D acceleration options for the SGI Indigo workstation, designed specifically for demanding professional applications in rendering, , and . It utilized four SGI GE7 geometry engines operating in parallel to handle complex 3D transformations and rendering tasks. This quad-chip configuration enabled performance of approximately 370,000 flat-shaded triangles per second and 180,000 lit Gouraud-shaded Z-buffered triangles per second under typical workloads. The architecture emphasized scalability, surpassing the dual-chip limitations of lower-tier options like XZ Graphics by distributing across multiple engines for enhanced throughput in real-time scenarios. Key advanced features included full hardware support for texturing with perspective correction and mip-mapping at 8- to 32-bits per , for smooth surface , and double buffering to eliminate flicker during dynamic scene updates. A 24-bit RGB was complemented by a 24-bit Z-buffer for depth sorting and hidden surface removal. The raster engine featured a variable-depth of 25 to 40 stages, optimized via SIMD to accelerate pixel-level operations such as blending, , and fog effects, making it particularly suited for real-time 3D and scientific where interactive frame rates were essential. The subsystem supported 16 to 32 MB of VRAM in a 5-way interleaved configuration, providing 56 bits per (including 24-bit color, 24-bit Z, and overlay/underlay planes) to handle high-resolution displays up to 1280×1024. This memory setup allowed for efficient DMA transfers and sustained fill rates, though actual capacity varied by configuration. Housed across multiple boards in the subsystem, connected via the GIO bus—including daughterboards for , rasterization, and video—it was a premium upgrade rarely integrated into base Indigo models due to its complexity and footprint. The Elan Graphics was targeted at high-end users requiring maximum 3D performance, such as in CAD/CAM and , and was compatible with via the IRIS Graphics Library for seamless integration.

Software support

Operating system

The SGI Indigo workstation primarily ran , Silicon Graphics' proprietary implementation of the UNIX operating system, which evolved from earlier versions of the 4Sight OS and incorporated elements from both BSD and System V UNIX. 4.0, released in 1991, marked the initial operating system for the R3000-based Indigo models, providing foundational support for the workstation's , while subsequent releases extended compatibility to the processor variants introduced in 1992. The supported versions ranged from 4.0 to 5.3 for R3000-based systems (with at least 32 MB RAM required for 5.3) and from 4.0.5 to 6.5.22 for -based configurations, with the 5.x series bridging the transition and introducing enhancements like improved networking and management. Throughout its lifecycle, on Indigo integrated the starting with 4.0, which included X11 Release 4 and the 4DWM for graphical user interfaces. IRIX's kernel on the Indigo was a monolithic, 32-bit design for all supported models, emphasizing multi-user and multi-tasking capabilities typical of UNIX systems, including preemptive scheduling and management. It supported network file sharing via (Network File System) for distributed environments, compliance for portability, and X/Open standards for application interoperability. Although IRIX 6.0 introduced 64-bit kernel addressing for higher-end SGI hardware, Indigo systems remained on 32-bit kernels due to the platform's architecture, with full 64-bit kernel support introduced for higher-end SGI hardware starting with the R8000 processor, ensuring with earlier binaries. Graphics support was natively handled through the IRIS GL , SGI's proprietary 3D graphics API that served as the precursor to ; this allowed direct acceleration of Indigo's onboard and optional graphics subsystems without additional drivers. compatibility was added in later IRIX versions, such as 5.0, enabling seamless transition for developers. Installation of IRIX on Indigo typically involved booting from a CD-ROM drive or 1/4-inch cartridge tape, using the system's PROM monitor to initiate the process and partition the internal SCSI disk. Early IRIX versions employed the EFS (Extent File System), which imposed a practical limit of approximately 2 GB per filesystem volume due to 32-bit addressing constraints, though later releases from IRIX 5.3 onward supported the XFS (Extent File System) for larger capacities on compatible hardware. Official support for IRIX ended with the discontinuation of general availability on December 29, 2006, after the release of IRIX 6.5.30, though extended maintenance was available for select customers until 2013. For legacy preservation, modern alternatives include the NetBSD/sgimips port, which provides ongoing support for Indigo's IP12 and IP20 platforms through community-driven updates.

Applications and ecosystem

The SGI Indigo workstation supported a suite of native applications optimized for its IRIS GL and graphics APIs, particularly in professional 3D content creation. Alias emerged as a flagship tool for , , and rendering, natively developed for on SGI hardware including the Indigo series, where it leveraged hardware-accelerated geometry and shading for efficient workflows in film and design. Similarly, Softimage provided advanced and visual effects capabilities, with versions like ported specifically to platforms such as the Indigo, enabling complex character rigging and integration in production pipelines. Development on the Indigo centered around the MIPSpro compiler suite, which included optimizing compilers for C, C++, and , generating efficient code for the MIPS and processors while supporting parallelization for compute-intensive tasks. The Motif toolkit served as the standard for building graphical user interfaces, facilitating cross-application consistency in the environment and aiding developers in creating interactive tools for engineering and media. The Indigo's balance of CPU power and graphics made it a preferred platform for Hollywood production, where studios used it for iterative modeling and real-time previews in films like . The broader ecosystem integrated seamlessly with SGI's Challenge servers, enabling Indigo workstations to offload heavy computations via NFS networking for distributed rendering and simulation in multi-user environments. Third-party support enriched this landscape, with ' Advanced Visualizer providing high-end modeling and dynamics tools tailored to SGI's architecture before its 1995 acquisition by SGI. Discreet Logic contributed solutions like , which ran on Indigo systems to handle real-time video effects and keying in , bridging with industry-standard pipelines. Although the Indigo focused on IRIX as its primary OS, limited experimental ports existed through MIPS-specific distributions like , primarily for hobbyist use but with emphasis remaining on native IRIX binaries for professional applications. These elements supported real-time rendering workflows that transformed CAD and CAE sectors, allowing engineers to interact with complex models and simulations interactively, thus accelerating design iteration in automotive and aerospace industries.

Legacy

Timeline within SGI products

The IRIS was announced in July 1991 as ' new entry-level workstation, succeeding the Personal IRIS series that had been introduced in 1988, as part of SGI's transition from the IRIS 4D series. This launch positioned the as an entry-level personal workstation optimized for the MIPS R3000A processor, aligning with the company's ongoing shift to MIPS RISC architecture that began in the late 1980s. In early 1992, SGI expanded the Indigo lineup with enhanced graphics options, including the XS and XS24 subsystems announced in and shipping by March, followed by the Elan graphics in April. Later that year, in September 1992, the upgrade became available for the Indigo, introducing 64-bit processing capabilities shortly after the server's release in 1992, which was SGI's initial R4000-based system targeted at higher-end computing needs. These developments reinforced SGI's dominance in professional graphics workstations during the early , bridging the gap between the resource-intensive 4D series and more accessible personal systems. By 1993, the Indigo began to be phased out in favor of newer models, including the Indigo2 (IP22 architecture) introduced in January and the low-end Indy (also IP22) launched in July, both of which offered improved performance and expanded market reach. Production of the Indigo continued until August 1995, serving as a transitional product in SGI's evolution toward the Visual Workstation era, with service support ending in July 2003. This chronology preceded the O2 workstation's release in 1996, further emphasizing SGI's focus on integrated graphics and multimedia for . The SGI Indigo represented a pivotal advancement in making high-performance 3D graphics workstations more accessible, lowering the entry barrier for industries reliant on (CGI) and visualization. By integrating cost-effective hardware acceleration with MIPS processors, it enabled faster rendering and modeling workflows that were previously confined to expensive supercomputers. This shift significantly boosted CGI adoption in film production, where the Indigo's capabilities allowed visual effects teams to handle complex 3D tasks more efficiently. For instance, () employed over 70 SGI workstations, including models from the Indigo family, to create the animations in (1993), marking a landmark in integrating real-time 3D graphics into blockbuster cinema. During the mid-1990s, SGI systems like the Indigo held a dominant position in Hollywood's pipeline, powering much of the era's groundbreaking CGI work across major studios. In , the Indigo gained iconic status through its on-screen appearance in , where it depicted the dinosaur theme park's central control system. In a memorable scene, the protagonists' children navigate the workstation's using the real SGI application FSN (File System Navigator) to override security protocols and lock facility doors, famously exclaiming, "It's a UNIX system—I know this!" The film's end credits explicitly acknowledged for providing IRIS Indigo Elan systems and other workstations, blending fictional narrative with authentic technology to highlight the Indigo's role in futuristic computing. This portrayal not only popularized SGI hardware among general audiences but also underscored the "SGI revolution" in graphics, as referenced in contemporary tech media covering the company's influence on digital effects. The Indigo contributed to Silicon Graphics' commercial zenith, with the company achieving peak annual revenues of $3.7 billion in amid surging demand for its graphics solutions. Its architectural innovations in hardware-accelerated laid foundational influences on modern GPU development, particularly through advancements in parallel processing and standards like that SGI pioneered. Today, Indigo systems enjoy sustained collector interest due to their historical role in milestones, with enthusiasts preserving hardware and developing emulation software to run legacy environments. However, the workstation's high price—often exceeding $10,000 for base configurations—restricted broader market penetration, and by the late 1990s, rising PC graphics performance from vendors like rendered it obsolete for many applications.

References

  1. http://www.sgistuff.net/hardware/systems/documents/indigo-announce.txt
  2. https://www.nytimes.com/1991/07/22/business/silicon-graphics-to-offer-a-cheaper-work-station.html
  3. http://www.sgistuff.net/hardware/systems/indigo.html
  4. https://www.techmonitor.ai/technology/silicon_graphics_launches_r4000_based_indigos_no_mention_of_ace
  5. https://wiki.preterhuman.net/SGI_Indigo
  6. https://archive.irixnet.org/developerforum95/Silicon_Graphics_Developer_Forum_95_The_CD_Volume_2/documents/hw_handbook_html/lexicon.html
  7. https://bukosek.si/hardware/collection/sgi-indigo/indigo-service-manual.pdf
  8. http://www.sgistuff.net/hardware/systems/documents/007-9065-050-indigo.pdf
  9. http://www.megarat.com/indigo/
  10. http://www.sgistuff.net/hardware/graphics/entry.html
  11. http://sgifiles.irixnet.org/sgi/indigo/hardware/gfx/
  12. https://bukosek.si/hardware/collection/sgi-indigo.html
  13. https://rainbow.ldeo.columbia.edu/documentation/sgi-faq/hardware/18.html
  14. http://www.sgidepot.co.uk/indigo.html
  15. http://www.sgistuff.net/hardware/systems/documents/IndigoFamilyTR-1.html
  16. http://www.sgistuff.net/hardware/graphics/express.html
  17. http://www.sgidepot.co.uk/gfxtables.html
  18. https://ryan.thoryk.com/sgi/irix_versions.html
  19. http://www.sgistuff.net/software/irixhistory/index.html
  20. http://archive.irixnet.org/sgistuff/hardware/systems/indigo.html
  21. https://software.majix.org/irix/install-versions.shtml
  22. https://www.operating-system.org/betriebssystem/_english/bs-irix.htm
  23. http://www.sgidepot.co.uk/i2sec8.html
  24. https://forums.irixnet.org/thread-1691.html
  25. https://techpubs.jurassic.nl/library/manuals/2000/007-2392-003/pdf/007-2392-003.pdf
  26. https://forums.sgi.sh/index.php?threads/how-to-format-large-hd-to-install-irix-in-efs-format.268/
  27. https://www.cnet.com/tech/services-and-software/sgis-unix-variant-fading-into-history/
  28. https://wiki.netbsd.org/ports/sgimips/
  29. https://download.autodesk.com/us/aliasstudio/qualcharts/alias_7.0.html
  30. https://xsisupport.com/tag/sgi/
  31. https://www.astro.ku.dk/~aake/optimize/64bit.html
  32. http://www.sgistuff.net/funstuff/hollywood/jpark.html
  33. http://computergraphmuseum.free.fr/silicongraphics.htm
  34. https://xsisupport.com/tag/discreet-logic/
  35. http://www.sgistuff.net/software/otheros/index.html
  36. http://www.sgistuff.net/hardware/systems/personal.html
  37. http://www.sgistuff.net/hardware/systems/crimson.html
  38. http://www.sgistuff.net/hardware/systems/indigo2.html
  39. https://www.computinghistory.org.uk/det/11261/SGI-Indy/
  40. https://www.computinghistory.org.uk/det/11262/SGI-O2/
  41. https://www.linkedin.com/pulse/sgis-rise-fall-cautionary-tale-don-lovett-kzfqe
  42. https://www.wired.com/1994/01/sgi/
  43. https://www.latimes.com/archives/la-xpm-2004-apr-05-fi-sgi5-story.html
  44. https://mcclanahoochie.com/blog/wp-content/uploads/2011/03/gpu-hist-paper.pdf
  45. https://tedium.co/2018/10/04/sgi-collector-history/
  46. https://hackaday.com/2024/04/08/the-rise-and-fall-of-silicon-graphics/
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